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Weatherly, when I installed a new drain tube between my fish locker and splash well (1979 22' Revenge) I used both the O-ring as well as Boat Life Caulk. I seated the O-ring with the caulk just before I tightened the tube and then spread the caulk around the completed fitting. What type of clearance between the flanged tube and the wall of the hull for the caulk without the O-ring? I kinda questioned the little O-ring by itself as a 100% seal.

Garris